Date: Wed, 21 Jul 2021 11:58:46 +0200 From: Rainer Duffner <rainer@ultra-secure.de> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: CPU hot-plug and RAM hot-add in virtual machines Message-ID: <EBE2D8B0-37CB-434A-8AF8-68B818142927@ultra-secure.de> In-Reply-To: <b849f8d3-661e-f5c5-c5e6-594219dbd842@quip.cz> References: <4336a1bf-d826-dba3-9ec1-9b48cf7cd177@quip.cz> <70033628-bc3a-24d2-4c65-9a3b9c1c66d5@FreeBSD.org> <b849f8d3-661e-f5c5-c5e6-594219dbd842@quip.cz>
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> Am 21.07.2021 um 10:53 schrieb Miroslav Lachman <000.fbsd@quip.cz>: >=20 > On 09/07/2021 13:16, Andriy Gapon wrote: >> On 08/07/2021 00:34, Miroslav Lachman wrote: >>> The question is simple but I cannot find answer - Does FreeBSD = support hot-plug vCPU and hot-add RAM? >>> Current virtualization platforms support adding CPU cores or = additional RAM without the need to reboot the guest OS. Some of our = clients need to add additional vCPUs or RAM so often that hot-plug and = hot-add will be really useful. If this is not supported on FreeBSD for = now, is there any Work In Progress? Or is there a plan to support it? >> I think that those features are not supported and I haven't heard of = any WIP. >=20 > Thank you for your reply. I know nothing about system internals. Is it = too much work to implement it or just nobody from developers need it = thus nobody write the code? Virtualization is more and more popular = these days so I think it will be useful for many users. >=20 > Kind regards > Miroslav Lachman >=20 My guess is that it=E2=80=99s something that is very much tied to the = Linux kernel. AFAIK, it works on RHEL (and derivatives), and that=E2=80=99s usually a = sign that it=E2=80=99s 100% tied to the Linux-kernel. We have over 20 Vcenters (yeah...) with thousands of VMs and AFAIK, only = one customer has ever requested that feature. Do you really need it that badly?
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